Code No. P1276 : Fuel Filter Exchange <Vehicles for General Export, Russia>








OPERATION



FUNCTION



TROUBLE JUDGMENT


Check Condition
Judgment Criterion

FAIL-SAFE AND BACKUP FUNCTION



PROBABLE CAUSES




DIAGNOSIS PROCEDURE

STEP 1. Connector check: A-114 fuel filter pressure switch connector

Q. Is the check result normal?
Go to Step 2 .
Repair or replace the connector.

STEP 2. Perform voltage measurement at A-114 fuel filter pressure switch connector.

  • Disconnect connector, and measure at harness side.
  • Ignition switch: ON
  • Voltage between terminal No. 1 and earth.

Q. Is the check result normal?
Go to Step 6 .
Go to Step 3 .

STEP 3. Connector check: C-115 engine-ECU connector

Q. Is the check result normal?
Go to Step 4 .
Repair or replace the connector.

STEP 4. Check harness between A-114 (terminal No. 1) fuel filter pressure switch connector and C-115 (terminal No. 110) engine-ECU connector.

  • Check output line for open/short circuit.

Q. Is the check result normal?
Go to Step 5 .
Repair the damaged harness wire.

STEP 5. M.U.T.-III data list

  • Refer to Data List Reference Table .

    1. Item 152: Fuel filter pressure switch

Q. Is the check result normal?
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).
Replace the engine-ECU. After replacing the engine-ECU, register the injector identification code and learn fuel injection (Refer to GROUP 00 - Precautions Before Service - What The Common Rail Engine Learns ).

STEP 6. Perform resistance measurement at A-114 fuel filter pressure switch connector.

  • Disconnect connector, and measure at harness side.
  • Resistance between terminal No. 2 and earth.
OK: Continuity (2 Ω or less)

Q. Is the check result normal?
Go to Step 7 .

    Check and repair harness between A-114 (terminal No. 2) fuel filter pressure switch connector and body earth.

    • Check earthing line for open circuit and damage.

STEP 7. Connector check: C-115 engine-ECU connector

Q. Is the check result normal?
Go to Step 8 .
Repair or replace the connector.

STEP 8. Check harness between A-114 (terminal No. 1) fuel filter pressure switch connector and C-115 (terminal No. 110) engine-ECU connector.

  • Check output line for damage.

Q. Is the check result normal?
Go to Step 9 .
Repair the damaged harness wire.

STEP 9. Replace the fuel filter cartridge.

  • After replacing the fuel filter cartridge, reconfirm whether the diagnosis code is set.

Q. Is the check result normal?
Replace the fuel filter pump.
The check is end.